Here’s a no-PCB Arduino that doesn’t obscure the DIP footprint of the AVR chip. It’s built on an ATmega88 chip, and includes a programming header, reset button, a couple of filtering caps ...

But you would if you’re a hacker stuck with a radio built in 2005 ... and an audio amplifier based on the LM386. A single button on the Arduino helps cycle through a range of preset frequencies ...